a pair but not a pair

I'm fascinated by these vases. At first glance they appear to be a pair but on close examination although the design is very very similar, the base vases are quite different. One vase is much lighter and thinner than the other which is a typical cobalt blue heavy glass vase. The light one weighs 220g and the heavy one weighs 320g. The lighter one obviously chips quite easily and has chips around the rim whereas the heavier vase has no chips around the rim.

pair decorated cobalt blue hyacinth vases

pair decorated cobalt blue hyacinth vases